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Anomalous elastic behavior and high-pressure structural evolution of zeolite levyne

¹ Bayerisches Geoinstitut, Universitaet Bayreuth, Universitaet Strasse 30, D-95447 Bayreuth, Germany
² Dipartimento di Scienze della Terra, Università di Perugia, Piazza Università, I-06100 Perugia, Italy

Elastic behavior and high-pressure (HP) structural evolution of a natural zeolite levyne, (Ca_0.5,Na,K)₆(Al₆Si₁₂O₃₆)·18H₂O, has been investigated up to 5 GPa by means of in situ single-crystal X-ray diffraction with a diamond-anvil cell using a non-penetrating pressure-transmitting medium. Peculiar elastic behavior has been observed in the range 0–1 GPa: the c parameter decreases between 0 and 0.2 GPa, then increases up to 0.5–0.6 GPa. Above this P-value, the parameter decreases as expected. Anomalous behavior is also shown by the a-parameter, which first increases up to 0.2 GPa, then decreases as expected. However, these anomalous lattice variations are only slightly reflected in the cell volume behavior. The low-P trend (P < 1 GPa) is also followed by the lattice parameters in decompression. The isothermal Equation-of-State (EoS) at P > 1 GPa, refined with a second-order Birch-Murnaghan EoS, yields the following parameters: V₀ = 3539(3) ų and K_T0 = 48(1) GPa. Comparison of structural refinements performed at 0.0001, 0.79(5), and 3.00(5) GPa highlights two distinct deformation mechanisms of the Si/Al-framework, one predominant at low pressures (0–1 GPa) and the other at high pressures (1–5 GPa).

The extra-framework content does not show any evident modification within the pressure range investigated.

This article has been cited by other articles:

				G. D. Gatta, F. Nestola, and T. B. Ballaran Elastic behavior, phase transition, and pressure induced structural evolution of analcime American Mineralogist, April 1, 2006; 91(4): 568 - 578. [Abstract] [Full Text] [PDF]